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I need parts for an old Tachometer


 
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Tom from Buckeye Lake
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PostPosted: Wed Sep 12, 2012 11:45 am    Post subject: I need parts for an old Tachometer Reply to specific post Reply with quote

I bought this old Jones Model 4800 hand held mechanical tach. It is missing the two external cone shape rubber drive inserts. As old as this is I understand them missing.

Anyone here have an idea where I could purchase replacements?

Thanks, Tom



 
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wisbaker
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PostPosted: Wed Sep 12, 2012 12:38 pm    Post subject: Re: I need parts for an old Tachometer Reply to specific post Reply with quote

Might be just as easy to make the darn things. If it was mine I think I'd start on the pages of the McMaster-Carr Supply catalog and see if they have anything rubber that is close to what I needed, might find some O-ring stock or maybe even one of those funky round rubber belts, rubber extrusions, some kind of packing or round gasket stock.
 
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bjb in TX from Ne
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PostPosted: Wed Sep 12, 2012 12:44 pm    Post subject: Re: I need parts for an old Tachometer Reply to specific post Reply with quote

You would have to call them and find out which one would fit but McMaster has several types with replacement tips available:

Contact Tachometer and parts
 
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Bret4207
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Location: St Lawrence Valley, Northern NY

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PostPosted: Wed Sep 12, 2012 1:47 pm    Post subject: Re: I need parts for an old Tachometer Reply to specific post Reply with quote

I bet Cratex grinding bobs could be made to fit and ground to a cone shape.
 
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RodinNS
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PostPosted: Wed Sep 12, 2012 3:25 pm    Post subject: Re: I need parts for an old Tachometer Reply to specific post Reply with quote

I'd think someone could turn them on a lathe out of a block of rubber.... Frozen hockey puck comes to mind.

Rod
 
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wisbaker
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PostPosted: Wed Sep 12, 2012 4:59 pm    Post subject: Re: I need parts for an old Tachometer Reply to specific post Reply with quote

I don't even think you would need a lathe, chuck it in a drill and shape it with sand paper or any other tool you have handy that'll give you the shape you need, especially it you get round rubber stock the right diameter to squeeze into your collets.
 
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ohfred41
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PostPosted: Wed Sep 12, 2012 7:24 pm    Post subject: Re: I need parts for an old Tachometer Reply to specific post Reply with quote

Wisbacker, You're close to my thoughts. But, how about some RTV in a tube and kinda shape it before it sets up? ohfred41
 
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bill b va
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PostPosted: Wed Sep 12, 2012 8:06 pm    Post subject: Re: I need parts for an old Tachometer Reply to specific post Reply with quote


check rubber plugs/stoppers at lowes .
 
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Old Iowa
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PostPosted: Wed Sep 12, 2012 9:28 pm    Post subject: Re: I need parts for an old Tachometer Reply to specific post Reply with quote

I have made them for years. I just stop at any good hardware store and buy rubber plugs/stoppers. I then trim them with a utility knife to about the size I want. I then finish them off with the screen type emery cloth. I usually get them to fit tight enough that they will stay in without any help. If I get one that is loose I just clean everything up and silicone it in. Let it dry and trim the extra off.
 
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Tom from Buckeye Lake
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PostPosted: Thu Sep 13, 2012 4:27 am    Post subject: Re: I need parts for an old Tachometer Reply to specific post Reply with quote

Thanks for the replies, all good ideas !!
 
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bill mart
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PostPosted: Thu Sep 13, 2012 4:35 am    Post subject: Re: I need parts for an old Tachometer Reply to specific post Reply with quote

Mcmaster Carr has almost everything dont they. Use them all the time. Bill
 
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bjb in TX from Ne
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PostPosted: Thu Sep 13, 2012 7:35 am    Post subject: Re: I need parts for an old Tachometer Reply to specific post Reply with quote

Almost. I have found somethings they don't quite carry. I needed a radial spring for my JD LUC carb choke. They didnt have one that was exact enough. I ended up going to a piano repair shop with my calipers and got the correct size of piano wire and made my own.
 
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Mike M
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PostPosted: Thu Sep 13, 2012 10:48 am    Post subject: Re: I need parts for an old Tachometer Reply to specific post Reply with quote

Are you talking about the spring that streches accross the choke plate to hold the flapper closed ? If so I get them at my local New Holland dealer. Same size fits in 8N Fords.
 
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Tom from Buckeye Lake
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PostPosted: Sat Sep 15, 2012 5:53 am    Post subject: Re: I need parts for an old Tachometer Reply to specific post Reply with quote

Got it done, sorta!

I pulled the concave rubber drive out of the metal driver, turned it over, stuck it in the freezer in my garage.

Chucked it in my drill motor and held it against the turning grinding wheel of my pedistal grinder. Will work till I find rubber stock.

Thanks
 
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